221163890 has 8 divisors (see below), whose sum is σ = 398095020. Its totient is φ = 88465552.

The previous prime is 221163871. The next prime is 221163893. The reversal of 221163890 is 98361122.

It can be written as a sum of positive squares in 2 ways, for example, as 221087161 + 76729 = 14869^2 + 277^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221163893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11058185 + ... + 11058204.

Almost surely, 2^221163890 is an apocalyptic number.

221163890 is a deficient number, since it is larger than the sum of its proper divisors (176931130).

221163890 is a wasteful number, since it uses less digits than its factorization.

221163890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22116396.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 221163890 is about 14871.5799429650. The cubic root of 221163890 is about 604.7437751155.

The spelling of 221163890 in words is "two hundred twenty-one million, one hundred sixty-three thousand, eight hundred ninety".